Method of producing selvage roll roofing



July 2, 1957 J. R. OLDFIELD ET AL 2,798,006

METHOD OF PRODUCING SELVAGE ROLL. ROOFING Filed May '7, 1954 2Sheets-Sheet l aal/1727i;

Zacasaw/ Juy 2, 1.957 J. R. OLDFIELD ET AL 2,798,005

METHOD OF PRODUCING SELVAGE ROLL ROOFING Filed May 7, 1954 2sheets-sheet 2 Ill a 2,798,006 `Patented July 2, 1957 METHOD F PRODUCINGSELVAGE ROLL ROOFING James R. Oldeld, Terrasse Vaudreuil, Quebec, andWilliam A. Lawson, Cote St. Luc, Quebec, Canada, assignors to BuildingProducts Limited, le/ioatreai Quebec, Canada Application May 7, 1954,Serial No. 428,206

7 Claims. (Cl. 117-9) This invention relates to improvements in rollroofing of the kind commonly referred to in the trade as selvage rollroofing.

In the manufacture of selvage roll rooting a relatively thick coating ofasphalt or similar waterproof adhesive material is applied to the lowerhalf of a saturated felt base and is then covered by a surface layer ofgranules partially embedded in the coating. The upper half of thesaturated felt base is usually left uncoated.

Strips of the selvage rooting are laid in courses so that the coated andgranular surfaced halves of the strips in one course overlap and arecemented to the uncoated upper halves or selvage areas of the strips ofthe next lower course, the forward or lower edges of the strips in eachcourse being butted against the raised portions formed by the upperedges of the granular surfaced coating of the strips in the next lowercourse.

An objectionable feature of selvage roll rooting as heretoforemanufactured is that the upper edge of the granular surfaced coatingcovering the lower half of the felt base of each roofing strip is oftenirregular or ragged instead of being straight. This is due tounavoidable ow of the asphalt coating during the manufacturing processand gives rise to several ditiiculties. It makes it difcult to obtainalignment of the contiguous courses during the laying of the rooting andit also makes it diicult to avoid exposure to the weather of portions ofthe uncoated selvage areas of the roofing strips immediately adjoiningthe irregular or ragged upper edges of the coated and granular surfacedportions.

According to the present invention a narrow band of the granularsurfaced coating immediately adjoining the selvage area of the base ofeach roofing strip is depressed below the plane of the remaining portionof said coating to provide a perfectly straight raised portion at thejuncture of the depressed and non-depressed portions of said coating.The roong strips thus produced are laid in courses with the forward orlower edges of the strips in each course butted against the straightraised portions provided at the upper edges of the non-depressedportions of the granular surfaced coatings of the strips in the nextlower course and with the overlapping surfaces of the strips inadjoining or contiguous courses cemented together in the usual manner.The straight raised portions presented by the upper edges of thenon-depressed granular surfaced coatings of the roofing stripseliminates the diiculty previously experienced in laying the rooting soas to obtain proper alignment of the contiguous courses. Moreover, thedepression of the granular surfaced coating of each rooting strip alonga narrow band-like area immediately adjoining the selvage area hasanother important advantage. It causes the granules lying within saidband-like area to be completely embedded in the underlying coating sothat the latter is brought to the surface and improves the adhesionbetween the overlapping portions of the roofing strips in contiguouscourses at the place where good adhesion is most important, namely,

in the immediate vicinity of the joints formed by butting the forward orlower edges of the roofing strips in one course against the raisedportions formed by the upper edges of the non-depressed portions of thegranular surfaced coatings of the rooting strips in the next lowercourse.

The present invention is applicable to conventional selvage rootingstrips having uncoated selvage areas and, also, to selvage roofingstrips having the selvage areas protected by a coating of asphalt or thelike which is thinner than the granular surfaced coating covering thelower halves of the strips. As applied to selvage rooting strips havinguncoated selvage areas the invention is advantageous in that, inaddition to facilitating the proper alignment of contiguous courses ofthe roong strips, it eliminates exposure to the weather of any portionof the uncoated selvage areas of the roofing strips. In this connectionit will be apparent that, since the depressed portion of the granularsurfaced coatings of the rooting strips in one course are overlapped bythe lower or forward portions of the strips in the next upper course,there is no possibility of any portion of the uncoated selvage areas ofthe strips being exposed to the weather.

Other characteristic features and advantages of the invention will beapparent from the following detailed description of the accompanyingdrawings:

Fig. l is a plan View of a portion of a selvage roofing strip of thetype in which the upper half or selvage area is protected by a coatingof adhesive or similar waterproof cementitious material which is thinnerthan granular surfaced coating applied to the lower half of the strip.

Fig. 2 is a sectional view taken substantially along the section line 22 of Fig. l.

Fig. 3 is a View, similar to Fig. l but showing the strip as it appearsafter it has been subjected to the present operation whereby a narrowband of the granular surfaced coating immediately adjoining the selvagearea of the strip is depressed below the remaining portion of saidcoating.

Fig. 4 is a sectional View taken substantially along the section line 44 of Fig. 3.

Fig. 5 is a View in side elevation of one form of apparatus which may beemployed in producing the rooting strip shown in Figs. 3 and 4 and Fig.6 is an enlarged sectional View of a portion of the apparatus shown inFig. 5.

In the present drawings the invention is illustrated as applied to themanufacture of a selvage rooting strip having the upper half or selvagearea protected by a coating of asphalt or similar waterproofcementitious material which is thinner than the granular surfacedcoating applied to the lower half of the strip.

Referring now to Figs. l and 2, 4 designates a selvage rooting stripcomprising a saturated felt base 5 having the lower half 6 protected bya relatively thick coating 7 of asphalt or similar waterproof adhesivematerial and having the upper half or selvage area 8 covered by athinner coating 9 of the same waterproofing material. The relativelythick coating 7 is completely covered by a weather resistant layer 10 ofgranular material consisting of slate or other mineral granulespartially embedded in said coating. In making this type of roofing stripit is practically impossible to consistently avoid a flow of thegranular surfaced coating 7 which results in this coating presenting anirregular or ragged line 11 at the upper edge thereof immediatelyadjoining the selvage area 8. As previously stated, this irregular orragged line 11 not only interferes with proper alignment of contiguouscourses of the rooting strips but, in the case of rooting strips havinguncoated selvage areas 8, results in unavoidable exposure 3 to theweather of portions of the selvage area 8 lying immediately adjacent theragged line 11.

In the practice of the present invention the application of the coatings7 and 9 and the granular surfacing layer 10 is followed or accompaniedAbythe application of a layer 9a of -ne sand to the coating 9'to preventthe latter from sticking to contacting portions of the'roofing when theroofing is made into rolls for storage and shipping purposes. Therooting strip is then subjected to a pressing operation, preferably ahot pressing operation, whereby a narrow band 12 (Figs. 3, 4 and 5) ofthe granular surfaced coating 7 immediately adjoining the selvage area 8is depressed below the plane of the remaining portion 13 of saidcoating. The pressing element used in forming the depressed band l2 ofthe granular surfaced coating 7 must be of such a nature as to provide astraight raised portion i4 at the juncture of the depressed andnondepressed portions 12 and 13 of said coating. During the pressingoperation here referred to the granules lying within the band-like areal2 of the granular surfaced coating to which the pressure is applied arecaused to be completely embedded in the underlying portion of thecoating which is thus brought to the surface of the depressed area 12 topromote better adhesion of the overlapping portions of the roofingstrips in contiguous courses in the immediate vicinity of the jointformed by butting the lower or forward edges of the strips in one courseagainst the straight raised portions i4 of the strips in the next lowercourse.

As shown in Figs. 5 and 6 the depression of a portion of the granularsurfaced coating 7 of the roofing strip to provide the band-like area l2and the straight raised portion 14 is preferably accomplished by passingthe roofing strip over a backing-up roll 16 and beneath a pressureapplying roll 17 located directly above the backing-up roll. Theperipheral surface of the pressure applying roll 17 is stepped toprovide two peripheral portions 18 and i9 of different diameters andwidths. The roll i7 is arranged so that the narrower and smallerdiameter peripheral portion 18 bears upon and depresses a portion of thegranular surfaced coating 7, immediately adjoining the selvage area 8,to form the aforesaid depressed band-like area l2 in which the granules'1G are fully embedded so that the coating is brought to the surface ofthis depressed area 12. The Wider and larger diameter portion 19 of roll17 bears upon a band-like portion 9b of the sand surfaced coating 9immediately adjoining the granular surfaced coating 7 and causes theunderlying sand particles 9a to be depressed into the coating 9 which isthus brought to the surface to improve adhesion between the overlappingsurface of contiguous course of the roofing strip in the immediatevicinity of the depressed area l2. v

The roll 17 is preferably heated and this may be accomplished, as shownin Fig. 5, by the provision of burner pipes 20 through which llame isdirected against the periphery of the roll.

Having thus described the nature of our invention and a preferredembodiment thereof it will be understood that various modifications maybe made within the scope and spirit of the invention as defined by theappended claims.

What we claim is:

1. A method of producing selvage roll roofing which comprises applying arelatively thick coating of adhesive water-proof material to the lowerhalf of a felt base, covering said coating with a surface layer ofgranular particles partially embedded therein and depressing thegranular surfaced coating along a narrow band immediately adjoining theupper half of the felt base to provide a straight raised portion at thejuncture of the depressed and non-depressed portions of the coating.

2. A method of producing selvage roll roofing which CII comprisesapplying a relatively thick coating of waterproof cementitious materialto the lower half of a felt base, applying a thinner coating of the samematerial to the upper half or selvage area of the base, surfacing therelatively thick coating with a layer of granular particles partiallyembedded therein and depressing the granular surfaced coating along anarrow band immediately adjoining the upper half of the base to providea straight raised portion at the juncture 'of the depressed andnondepressed portions of the granular surfaced coating.

3. A method of producing selvage roll roong as set forth in claim l, inwhich the aforesaid depression of the granular surfaced coating along anarrow band immediately adjoining the upper half of the base is effectedby a. hot pressing operation in the course of which the granules lyingwithin said band are completely embedded in the underlying coating andthe latter is brought to the surface. l

4. A method of producing selvage roll roofing which comprises applying arelatively thick coating of adhesive water-proofing material to thelower half of a felt base, applying a thinner coating of the samematerial to the upper half of the selvage area of the base, ycoveringthe relatively thick coating with a surface layer of relatively coursegranular particles partially embedded therein, covering the thinnercoating with a layer of relatively fine sand particles, depressing therelatively thick granular surfaced coating along a narrow bandimmediately adjoining the upper half of the felt base to provide astraight raised portion at the juncture of the depressed andnondepressed portions of said coating and depressing the sand surfacedcoating along a band-like area immediately adjoining the depressedportion of the relatively thick coating.

5. A method of producing selvage roll roofing as set forth in `claim l,in which the aforesaid depression of the granular surfaced coating alonga narrow band immediately adjoining the upper half of the base iseffected by passing the coated base beneath a pressure applying rollerpresenting a peripheral portion of relatively large diameter bearing onthe upper half of the base and a second peripheral portion of smallerdiameter bearing on a portion of the granular surfaced coatingimmediately adjoining the upper half of the base.

6. A method of producing selvage roll roofing as Set forth in claim l,in which the aforesaid depression of the granular surfaced coating alonga narrow band immediately adjoining the upper half of the base iseffected by passing the coated base beneath a heated pressure applyingroller presenting a peripheral portion of relatively large diameterbearing on the upper half of the base and a second peripheral portion ofsmaller diameter bearing on a portion of the granular surfaced coatingimmediately adjoining the upper half of the base.

7. Selvage roll roofing comprising a felt base, a relatively thickcoating of granular surfaced water-proofing material covering the lowerhalf of the upper surface of the base, a narrow band of saidgranular-surfaced coating immediately adjoining the upper half or theselvage area of the base being depressed below the remaining portion ofsaid coating to provide a substantially straight raised and relativelynarrow band portion at the juncture of the depressed and non-depressedportions of the coating, the raised, narrow band portion extending thefull length of the roll roofing.

References Cited in the le of this patent UNITED STATES PATENTS

1. A METHOD OF PRODUCING SELVAGE ROLL ROOFING WHICH COMPRISES APPLYING ARELATIVELY THICK COATING OF ADHESIVE WATER-PROOF MATERIAL TO THE LOWERHALF OF A FELT BASE COVERING SAID COATING WITH A SURFACE LAYER OFGRANULAR PARTICLES PARTIALLY EMBEDDED THEREIN AND DEPRESSING THEGRANULAR SURFACED COATING ALONG A NARROW BAND IMMEDIATELY ADJOINING THEUPPER HALF OF THE FELT BASE TO PROVIDE A STRAIGHT RAISED PORTION AT THEJUNCTURE OF THE DEPRESSED AND NON-DEPRESSED PORTIONS OF THE COATING.